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G. ROTHACKER, Jr.

OPERA GLASS; No. 309,407. Patented-Dec. 16,1884.

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UNl'TED Srn'rns CARL ROTHAGKER, JR, OF PFORZHEIM, GERMANY.

OPE RA GLASS.

SPECIFICATION forming part of Letters Patent No. 309,401, dated December 16, 1884. Application filed August 4, 1884. (No model.)

To aZZ whom it may concern.-

Be it known that I, CARL RorrrAoKER, J r. a citizen of Germany, and residing at Pforzheim, Germany, have invented new and use ful Improvements in Opera-Glasses, of which the following is a specification.

This invention relates to a binocular operaglass adapted to be folded into the form of and be carried as a watch-chain trinket; and the invention consists in the folding or collapsible construction of frame, hereinafter described instead of the usual telescopic double-barreled body.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a face view of my improved 0pera-glass, the same being folded. Fig. 2'is a side View of the same folded. Fig. 3 is a side view of the same opened. Fig. 4 is aside view of the same partly folded.

The object-glass mounts A are short cylinders carried by pairs of arms f, working on a common hinge, so as to be capable of being folded together,with the eye-pieces B inclosed between them. The said arms are hinged to a cross-head, a, fitted to slide b upon the parallel limbs e of a central Ushaped frame, the eyepieces B being also carried by a pair of arms, h, hinged to another cross-head,d, fitted to a slide, 0, 011 the same U-shaped frame,'the two pairs of lenses being retained in their extended position, respectively, by a connectinglink, Z, holding the arms f f, and by a bolt, q, working in the guides 9 and g of the arms h h, and thus locking the hinged pairs of arms rigidly together, as shown in Fig. 8.

YVhcn the opera-glass is to be closed or folded, the cross-bar d, on which are the arms h,

carrying the eye-pieces B, is moved up toward the cross-bar a,- the eye-pieces B being folded against each other and brought together within and at opposite sides of the bow end of the U-shaped frame, after which the two objectglass mounts A are folded back and brought together at opposite sides of the eye-pieces B, so as to inclose the latter and the U-frame between them.

To protect the objectglasses, their mounts A are provided with hinged covers D, which inclose their outer ends, (when closed,) one cover having a hinged clasp or link,0, which engages with a catch, 9*, on the other and securely locks the whole in the closed position. (See Fig. 1.)

The glass is readily extended for use, and is focused by sliding the cross-heads on the central U-frame. (See Fig. 3.)

The cross-head a, which carries the objectglasses, is furnished witha swivel, K, for attachment to a chain.

Having thus described my invention and the manner of employing the same, I claim The herein-described construction of folding binocular opera-glass in which the lens-mounts are hinged to cross-heads sliding on a U shaped frame, and are adapted to be extended for use or to be folded into the form of a trinket, and to be retained in either of those positions, substantially in the manner and by the means herein specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CARL ROTHAOKER, J R. 

